The move concerns medical marijuana advocates, who say it could prevent patients from vaping prescription cannabis in their apartments.
Federal officials are scrambling to reverse a recent explosion in teen vaping that public health officials fear could undermine decades of declines in tobacco use.
When state voters legalized recreational marijuana through Amendment 64 earlier this decade, the e-cigarette industry had just started to take off.
Skyrocketing youth use of e-cigarettes, especially Juuls, has led to several government regulations around teen vaping.
Colorado is becoming an epicenter in the fight over teen vaping.
The new rules would also tighten regulations on online sales.
A 2017 Colorado survey observed a disconnect in how young people see vaping and e-cigarettes and the health risks.
A CDC finding that 25 percent of high schoolers vape coincides with a push in several mountain towns to raise the age for tobacco and nicotine purchases.
A new study also says that Colorado leads 37 states surveyed for use of electronic cigarettes among high school students.